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Finding the Fourth Proportional to 665.72, 998.50 and 178.80

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Solution

The fourth proportional to 665.72, 998.50 and 178.80 is: 268.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.72 : 998.50 = 178.80 : x
  2. Step 2: Convert to fraction form
    665.72/998.50 = 178.80/x
  3. Step 3: Cross multiply
    665.72x = 998.50 × 178.80
  4. Step 4: Simplify right side
    665.72x = 178,531.80
  5. Step 5: Solve for x
    x = 178,531.80/665.72
  6. Step 6: Final answer
    x = 268.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.